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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01ae0ee6bfd743bdc3dbcfb8ca1841c09701854a754be2d4a53fce0cbe348c49' 
  AND token = 'DpSN5S6ToY+6m4CHkGagOgdSh6wOKaq2RQaUe8WIf/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}